Last updated: June 24, 2025
In August, the average temperature in Waterloo, United States hovers around 25°C (77°F), creating a warm atmosphere for locals and visitors alike. Temperatures can drop to a refreshing 13°C (55°F) at night, while daytime highs can soar to a scorching 36°C (97°F). Expect some rain, with 123 mm (4.8 in) of precipitation over 12 days, contributing to an average humidity of 80% that adds to the region's unique climate.
In August in Waterloo, the average temperature is 25°C (77°F). Maximum can reach 36°C (97°F) and minimum can be as low as 13°C (55°F). Overall, it's a pleasant time to visit Waterloo, perfect for enjoying outdoor activities while being prepared for varying temperatures.
In Waterloo in August, the precipitation amount is 123 mm (4.8 in) during a period of 12 days.
In Waterloo in August humidity is 80%. With an average temperature of 25°C (77°F), this humidity feels like traveling through a warm, tropical rainforest where the air is thick and steamy, making even the simplest stroll feel like a workout.
In Waterloo in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Waterloo.
UV Risk Categories
Weather in Waterloo varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Waterloo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 79 mm (3.1 inches) | 82% | moderate |
| February Weather | 3°C (37°F) | 87 mm (3.4 inches) | 80% | moderate |
| March Weather | 9°C (48°F) | 136 mm (5.4 inches) | 80% | high |
| April Weather | 13°C (56°F) | 142 mm (5.6 inches) | 80% | very high |
| May Weather | 20°C (68°F) | 149 mm (5.9 inches) | 82% | very high |
| June Weather | 25°C (77°F) | 87 mm (3.4 inches) | 83% | extreme |
| July Weather | 27°C (80°F) | 89 mm (3.5 inches) | 81% | very high |
| August Weather | 25°C (77°F) | 123 mm (4.8 inches) | 80% | very high |
| September Weather | 22°C (73°F) | 66 mm (2.6 inches) | 76% | very high |
| October Weather | 15°C (60°F) | 109 mm (4.3 inches) | 76% | high |
| November Weather | 7°C (45°F) | 75 mm (2.9 inches) | 85% | moderate |
| December Weather | 4°C (40°F) | 68 mm (2.7 inches) | 86% | moderate |